The XSupportsLocale
function returns True if Xlib functions are capable of operating under
the current locale. If it returns False, Xlib locale-dependent functions
for which the XLocaleNotSupported return status is defined will return
XLocaleNotSupported. Other Xlib locale-dependent routines will operate
in the ``C'' locale.

The XSetLocaleModifiers function sets the X modifiers
for the current locale setting. The modifier_list argument is a null-terminated
string of the form ``{@category=value}'', that is, having zero or more concatenated
``@category=value'' entries, where category is a category name and value is
the (possibly empty) setting for that category. The values are encoded in
the current locale. Category names are restricted to the POSIX Portable
Filename Character Set.

The local host X locale modifiers announcer (on
POSIX-compliant systems, the XMODIFIERS environment variable) is appended
to the modifier_list to provide default values on the local host. If a given
category appears more than once in the list, the first setting in the list
is used. If a given category is not included in the full modifier list,
the category is set to an implementation-dependent default for the current
locale. An empty value for a category explicitly specifies the implementation-dependent
default.

If the function is successful, it returns a pointer to a string.
The contents of the string are such that a subsequent call with that string
(in the same locale) will restore the modifiers to the same settings. If
modifier_list is a NULL pointer, XSetLocaleModifiers also returns a pointer
to such a string, and the current locale modifiers are not changed.

If invalid
values are given for one or more modifier categories supported by the locale,
a NULL pointer is returned, and none of the current modifiers are changed.

At program startup, the modifiers that are in effect are unspecified until
the first successful call to set them. Whenever the locale is changed,
the modifiers that are in effect become unspecified until the next successful
call to set them. Clients should always call XSetLocaleModifiers with
a non-NULL modifier_list after setting the locale before they call any locale-dependent
Xlib routine.

The only standard modifier category currently defined is ``im'',
which identifies the desired input method. The values for input method are
not standardized. A single locale may use multiple input methods, switching
input method under user control. The modifier may specify the initial input
method in effect or an ordered list of input methods. Multiple input methods
may be specified in a single im value string in an implementation-dependent
manner.

The returned modifiers string is owned by Xlib and should not be
modified or freed by the client. It may be freed by Xlib after the current
locale or modifiers are changed. Until freed, it will not be modified by
Xlib.